Latest
- 8 bay: 1823xs+
- 12 bay: DS3622xs+
Practical
- 8 bay: DS1821+
- 12 bay: DS2422+
As post #24 offers, don't lean on only the NAS as backup as fire-flood-theft will get it too. So along with a NAS, add at least 1 or 2 BIG HDDs to rotate as offsite storage.
In other words, you could:
- Set all Macs in the house to automatically backup to the Synology Time Machine store
- Also choose 1 big local drive as a Time Machine backup too. Mac will automatically switch between Synology and this local one every other hour.
- 1 more big local drive as a TM backup to store offsite.
- Regularly rotate the offsite HDD with the onsite HDD so the offsite backup is fresh. I do this monthly, storing the offsite in a Bank Safe Deposit box.
In the event of a fire-flood-theft, you probably lose the Macs, the Synology NAS and the local TM backup, so that offsite one is the ultimate recovery option. Thus, it needs to be a fairly recent backup.
If you feel like you would never fill 8 bays, they make:
- 6 bay units: DS1621+ or DS620slim
- 5 bay: DS1522+
- 4 bay: DS923+ or DS423+
Price generally comes down as you buy smaller... but you are also buying smaller potential storage.
Synology is not the only NAS available. Other people swear by other brands like QNAP and similar. I'm a bit biased by using Synology for the last decade+. It "just works" fine for my purposes.